内置策略列表

本文档将按字典序展示所有内置策略的参数列表。

只交付部署资源，不保证终态一致、允许配置漂移。适用于与其他控制器协作的轻量级交付场景。

It’s generally used in one time delivery only without continuous management scenario.

名称	描述	类型	是否必须	默认值
selector	指定资源筛选目标规则。		false
strategy	Specify the strategy for configuring the resource level configuration drift behaviour。	strategy	true

名称	描述	类型	是否必须
componentNames	按组件名称选择目标资源。	[]string	false
componentTypes	按组件类型选择目标资源。	[]string	false
oamTypes	按 OAM 概念，组件(COMPONENT) 或运维特征(TRAIT) 筛选。	[]string	false
traitTypes	按 trait 类型选择目标资源。	[]string	false
resourceTypes	按资源类型选择。	[]string	false
resourceNames	按资源名称选择。	[]string	false

名称	描述	类型	是否必须	默认值
affect	When the strategy takes effect,e.g. onUpdate、onStateKeep。	string	false
path	指定资源的路径。	[]string	true

为应用配置资源回收策略。如配置资源不回收。


kind: Application
metadata:
  name: first-vela-app
spec:
  components:
    - name: express-server
      type: webservice
      properties:
        image: oamdev/hello-world
        port: 8000
      traits:
        - type: ingress-1-20
          properties:
            domain: testsvc.example.com
            http:
              "/": 8000
  policies:
    - name: keep-legacy-resource
      type: garbage-collect
      properties:
        keepLegacyResource: true

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: garbage-collect-app
spec:
  components:
    - name: hello-world-new
      type: webservice
      properties:
        image: oamdev/hello-world
      traits:
        - type: expose
          properties:
            port: [8000]
  policies:
    - name: garbage-collect
      type: garbage-collect
      properties:
        rules:
          - selector:
              traitTypes:
                - expose
            strategy: onAppDelete

名称	描述	类型	是否必须	默认值
keepLegacyResource	如果为 true，过时的版本化 resource tracker 将不会自动回收。过时的资源将被保留，直到手动删除 resource tracker。	bool	false	false
rules	在资源级别控制垃圾回收策略的规则列表，如果一个资源由多个规则控制，将使用第一个规则。		false

名称	描述	类型	是否必须
componentNames	按组件名称选择目标资源。	[]string	false
componentTypes	按组件类型选择目标资源。	[]string	false
oamTypes	按 OAM 概念，组件(COMPONENT) 或运维特征(TRAIT) 筛选。	[]string	false
traitTypes	按 trait 类型选择目标资源。	[]string	false
resourceTypes	按资源类型选择。	[]string	false
resourceNames	按资源名称选择。	[]string	false

Apply periodical health checking to the application。

名称	描述	类型	是否必须	默认值
probeTimeout	Specify health checking timeout(seconds), default 10s。	int	false	10
probeInterval	Specify health checking interval(seconds), default 30s。	int	false	30

描述部署资源时要覆盖的配置，需要配合工作流的 deploy 步骤一起使用才能生效。

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: deploy-with-override
  namespace: examples
spec:
  components:
    - name: nginx-with-override
      type: webservice
      properties:
        image: nginx
  policies:
    - name: topology-hangzhou-clusters
      type: topology
      properties:
        clusterLabelSelector:
          region: hangzhou
    - name: topology-local
      type: topology
      properties:
        clusters: ["local"]
        namespace: examples-alternative
    - name: override-nginx-legacy-image
      type: override
      properties:
        components:
          - name: nginx-with-override
            properties:
              image: nginx:1.20
    - name: override-high-availability
      type: override
      properties:
        components:
          - type: webservice
            traits:
              - type: scaler
                properties:
                  replicas: 3
  workflow:
    steps:
      - type: deploy
        name: deploy-local
        properties:
          policies: ["topology-local"]
      - type: deploy
        name: deploy-hangzhou
        properties:
          policies: ["topology-hangzhou-clusters", "override-nginx-legacy-image", "override-high-availability"]

名称	描述	类型	是否必须	默认值
components	要覆盖的组件配置列表。	[]components	true
selector	要使用的组件名称列表。如果未设置，将使用所有组件。	[]string	false

名称	描述	类型	是否必须
name	要覆盖的组件的名称。如果未设置，它将匹配具有指定类型的所有组件。可以与通配符 * 一起使用以进行模糊匹配。。	string	false
type	要覆盖的组件的类型。如果未设置，将匹配所有组件类型。	string	false
properties	要覆盖的配置属性，未填写配置会与原先的配置合并。	map[string]:_	false
traits	要覆盖的 trait 配置列表。		false

Describe the configuration to replicate components when deploying resources, it only works with specified deploy step in workflow。

In KubeVela, we can dispatch resources across the clusters. But projects like OpenYurt have finer-grained division like node pool. This requires to dispatch some similar resources to the same cluster. These resources are called replication. Back to the example of OpenYurt, it can integrate KubeVela and replicate the resources then dispatch them to the different node pool.

Replication is an internal policy. It can be only used with deploy workflow step. When using replication policy. A new field replicaKey will be added to context. User can use definitions that make use of . For example, apply a replica-webservice ComponentDefinition.

kind: ComponentDefinition
metadata:
  annotations:
    definition.oam.dev/description: Webservice, but can be replicated
  name: replica-webservice
  namespace: vela-system
spec:
  schematic:
    cue:
      template: |
        output: {
            apiVersion: "apps/v1"
            kind:       "Deployment"
            metadata: {
                if context.replicaKey != _|_ {
                    name: context.name + "-" + context.replicaKey
                }
                if context.replicaKey == _|_ {
                    name: context.name
                }
            }
            spec: {
                selector: matchLabels: {
                    "app.oam.dev/component": context.name
                    if context.replicaKey != _|_ {
                        "app.oam.dev/replicaKey": context.replicaKey
                    }
                }
                template: {
                    metadata: {
                        labels: {
                            if parameter.labels != _|_ {
                                parameter.labels
                            }
                            if parameter.addRevisionLabel {
                                "app.oam.dev/revision": context.revision
                            }
                            "app.oam.dev/name":      context.appName
                            "app.oam.dev/component": context.name
                            if context.replicaKey != _|_ {
                                "app.oam.dev/replicaKey": context.replicaKey
                            }
                        }
                        if parameter.annotations != _|_ {
                            annotations: parameter.annotations
                        }
                    }
                }
            }
        }
        outputs: {
            if len(exposePorts) != 0 {
                webserviceExpose: {
                    apiVersion: "v1"
                    kind:       "Service"
                    metadata: {
                        if context.replicaKey != _|_ {
                            name: context.name + "-" + context.replicaKey
                        }
                        if context.replicaKey == _|_ {
                            name: context.name
                        }
                    }
                    spec: {
                        selector: {
                            "app.oam.dev/component": context.name
                            if context.replicaKey != _|_ {
                                "app.oam.dev/replicaKey": context.replicaKey
                            }
                        }
                        ports: exposePorts
                        type:  parameter.exposeType
                    }
                }
            }
        }

Then user can apply application below. Replication policy is declared in application.spec.policies. These policies are used in deploy-with-rep workflow step. They work together to influence the deploy step.

override: select hello-rep component to deploy.
topology: select cluster local to deploy.
replication: select hello-rep component to replicate.

As a result, there will be two Deployments and two Services:

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: app-replication-policy
spec:
  components:
    - name: hello-rep
      type: replica-webservice
      properties:
        image: crccheck/hello-world
          - port: 80
  policies:
    - name: comp-to-replicate
      type: override
      properties:
        selector: [ "hello-rep" ]
    - name: target-default
      type: topology
      properties:
        clusters: [ "local" ]
    - name: replication-default
      type: replication
      properties:
        keys: ["beijing","hangzhou"]
        selector: ["hello-rep"]
  workflow:
    steps:
      - name: deploy-with-rep
        type: deploy
        properties:
          policies: ["comp-to-replicate","target-default","replication-default"]

kubectl get deploy -n default
NAME                 READY   UP-TO-DATE   AVAILABLE   AGE
hello-rep-beijing    1/1     1            1           5s
hello-rep-hangzhou   1/1     1            1           5s
kubectl get service -n default
NAME                 TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)   AGE
hello-rep-hangzhou   ClusterIP   10.43.23.200   <none>        80/TCP    41s
hello-rep-beijing    ClusterIP   10.43.24.116   <none>        80/TCP    12s

名称	描述	类型	是否必须	默认值
keys	Spicify the keys of replication. Every key coresponds to a replication components。	[]string	true
selector	Specify the components which will be replicated。	[]string	false

Configure the resources to be sharable across applications。

It’s used in scenario. It can be used to configure which resources can be shared between applications. The target resource will allow multiple application to read it but only the first one to be able to write it.

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: app2
spec:
  components:
    - name: ns2
      type: k8s-objects
      properties:
        objects:
          - apiVersion: v1
            kind: Namespace
            metadata:
              name: example
    - name: cm2
      type: k8s-objects
      properties:
        objects:
          - apiVersion: v1
            kind: ConfigMap
            metadata:
              name: cm2
              namespace: example
            data:
              key: value2
  policies:
    - name: shared-resource
      type: shared-resource
      properties:
        rules:
          - selector:
              resourceTypes: ["Namespace"]

名称	描述	类型	是否必须	默认值
rules	Specify the list of rules to control shared-resource strategy at resource level。	[]rules	false

名称	描述	类型	是否必须	默认值
selector	指定资源筛选目标规则。		true

名称	描述	类型	是否必须
componentNames	按组件名称选择目标资源。	[]string	false
componentTypes	按组件类型选择目标资源。	[]string	false
oamTypes	按 OAM 概念，组件(COMPONENT) 或运维特征(TRAIT) 筛选。	[]string	false
traitTypes	按 trait 类型选择目标资源。	[]string	false
resourceTypes	按资源类型选择。	[]string	false
resourceNames	按资源名称选择。	[]string	false

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: basic-topology
  namespace: examples
spec:
  components:
    - name: nginx-basic
      type: webservice
      properties:
        image: nginx
  policies:
    - name: topology-hangzhou-clusters
      type: topology
      properties:
        clusters: ["hangzhou-1", "hangzhou-2"]

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: label-selector-topology
  namespace: examples
spec:
  components:
    - name: nginx-label-selector
      type: webservice
      properties:
        image: nginx
  policies:
    - name: topology-hangzhou-clusters
      type: topology
      properties: